Observations of Raman-scattered He II lines in RR Telescopii reveal distinct velocities tracing different H I depths and temporal declines in conversion efficiency, implying the neutral region needs complex radiative transfer models beyond a single column density.
AKARI/IRC Near-Infrared Spectral Atlas of Galactic Planetary Nebulae
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abstract
Near-infrared (2.5-5.0$\,\mu$m) low-resolution ($\lambda/\Delta\lambda{\sim}100$) spectra of 72 Galactic planetary nebulae (PNe) were obtained with the Infrared Camera (IRC) in the post-helium phase. The IRC, equipped with a $1'{\times}1'$ window for spectroscopy of a point source, was capable of obtaining near-infrared spectra in a slit-less mode without any flux loss due to a slit. The spectra show emission features including hydrogen recombination lines and the 3.3-3.5$\,\mu$m hydrocarbon features. The intensity and equivalent width of the emission features were measured by spectral fitting. We made a catalog providing unique information on the investigation of the near-infrared emission of PNe. In this paper, details of the observations and characteristics of the catalog are described.
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High-Resolution Spectroscopy of Raman-scattered He II Lines in the Symbiotic Nova RR Telescopii
Observations of Raman-scattered He II lines in RR Telescopii reveal distinct velocities tracing different H I depths and temporal declines in conversion efficiency, implying the neutral region needs complex radiative transfer models beyond a single column density.